Key Spices and Their Uses in Scripture

Mentioned in Exodus 30:34 as one of the four mandatory components of the sacred incense used in the Tabernacle.

Believed to be the horny operculum (trapdoor) of Red Sea mollusks, it emits a strong,

fixative scent when burned. It symbolizes sanctified prayer. 

The Command: 

In Exodus 30:34-38, God instructs Moses

to take equal parts of stacte, onycha, galbanum,